Glibenclamide Prevents Hypoglycemia-Induced Fatal Cardiac Arrhythmias in Rats

Related Experiment Video

Updated: Feb 10, 2026

Methods for ECG Evaluation of Indicators of Cardiac Risk, and Susceptibility to Aconitine-induced Arrhythmias in Rats Following Status Epilepticus
08:28

Methods for ECG Evaluation of Indicators of Cardiac Risk, and Susceptibility to Aconitine-induced Arrhythmias in Rats Following Status Epilepticus

Published on: April 5, 2011

18.2K

Candace M Reno1, Justin Bayles1, Allie Skinner1

  • 1Division of Endocrinology, Metabolism, and Diabetes, Department of Internal Medicine, University of Utah, Salt Lake City, Utah.

Endocrinology
|May 26, 2018
PubMed

Insights

Glibenclamide, a sulfonylurea, paradoxically protected against fatal cardiac arrhythmias during severe hypoglycemia in rats. This KATP channel blocker prevented heart block and mortality, despite increasing hypoglycemia risk.

Area of Science:

  • Cardiovascular Science
  • Endocrinology
  • Pharmacology

Background:

  • Sulfonylureas are associated with severe hypoglycemia and potential cardiac risks in type 2 diabetes.
  • Sulfonylureas function by closing pancreatic ATP-sensitive potassium (KATP) channels, affecting insulin secretion.
  • The role of KATP channel modulators in hypoglycemia-induced cardiac events requires further investigation.

Purpose of the Study:

  • To investigate the impact of KATP channel modulators on cardiac arrhythmias and mortality during severe hypoglycemia.
  • To evaluate the protective effects of glibenclamide (KATP channel blocker) and diazoxide (KATP channel opener) in a rat model.

Main Methods:

  • Adult Sprague-Dawley rats underwent hyperinsulinemic-hypoglycemic clamps with continuous electrocardiography.
  • Rats were randomized to receive intravenous vehicle, glibenclamide (KATP channel blocker), or diazoxide (KATP channel opener).
  • Cardiac arrhythmias and mortality rates were assessed under induced severe hypoglycemia.

Main Results:

  • Glibenclamide completely prevented first- and third-degree heart block.
  • Second-degree heart block was significantly reduced by glibenclamide compared to vehicle and diazoxide.
  • Glibenclamide completely prevented hypoglycemia-induced mortality, unlike vehicle and diazoxide.
  • Diazoxide exacerbated cardiac arrhythmias and mortality during hypoglycemia.

Conclusions:

  • Glibenclamide exhibits a paradoxical protective effect against severe hypoglycemia-induced fatal cardiac arrhythmias.
  • KATP channel blockade by glibenclamide may mitigate cardiac risks associated with severe hypoglycemia.
  • These findings suggest a complex role for KATP channels in mediating cardiac outcomes during hypoglycemia.

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